I never really thought about it until recently..
My 21 year old mare is at the bottom of the pecking order. When it's feeding time, she stays well away from the other horses until you come, put a hand on her neck and take her to her stall. She knows the only thing stopping the other horses from chasing her and kicking her is me..
I remember at the NRHA Futurity in December, they didn't tell us about the bank that they put in the middle of the arena, shrinking our drill space to half what it normally is. We didn't have a single chance to look at it, me and my partner had to gallop in straight for it..Rosie snorted and tried to duck away from it many times, and with lots of "eeeasy Rosie" 's every time we went by it, she slowly did much better, even in just a six minute drill. She would NOT have gone through with the entire drill if she didn't at least slightly trust me:)